Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 10 - Drill bits
Patents for E21B 10 - Drill bits (19,464)
12/1987
12/08/1987US4711143 Rock bit assembly method
12/03/1987WO1987007342A1 Diamond bearing and manufacture thereof
12/03/1987WO1987007322A1 Apparatus for correcting irregularities in or enlarging an underground duct
12/03/1987DE3618198A1 Method for the production of picks
12/02/1987EP0247259A1 Hydrodynamic lubricant seal for drill bits
12/01/1987US4710244 Dredger teeth
12/01/1987US4710074 Casing mill
12/01/1987US4709462 Method for assembling a well drilling tool
11/1987
11/25/1987EP0246789A2 Cutter for a rotary drill bit, rotary drill bit with such a cutter, and method of manufacturing such a cutter
11/25/1987CN87202445U Tightening installation of two-way and double lock locating
11/24/1987US4708752 Process for laser hardening drilling bit cones having hard cutter inserts placed therein
11/24/1987US4708496 Diamond bearing and manufacture thereof
11/19/1987EP0245971A2 Hydraulic drilling apparatus and method
11/17/1987US4706765 Drill bit assembly
11/17/1987CA1229268A1 Machine for driving holes in the ground
11/11/1987EP0244947A1 Brazing process
11/10/1987US4705124 Sintering mixture of tungsten carbide and cobalt
11/10/1987US4705123 Cutting element for a rotary drill bit and method for making same
11/10/1987US4705122 Cutter assemblies for rotary drill bits
11/05/1987DE3614010A1 Rock drill rod - has steel shaft with bosses and recesses embedded in cast spiral of polymers e.g. propylene], styrene] PTFE, urethane]
11/03/1987US4703814 Earth boring bit having a replaceable, threaded nozzle with wrench socket
11/03/1987CA1228878A1 High speed seal
11/03/1987CA1228849A1 Rotary drill bits
11/03/1987CA1228751A1 Soil sample taker and vehicle mounting arrangement
10/1987
10/28/1987EP0242999A2 Improvements in or relating to cutting structures for rotary drill bits
10/28/1987CN86104793A Power-driven tool
10/21/1987EP0241750A2 Combination soil auger and soil core sampler with sample retaining capacity
10/21/1987CN86107578A Drill bits for drilling core
10/20/1987US4701073 Shaft sinking method
10/20/1987US4700790 Rotary drill bits
10/08/1987DE3610853A1 Drilling tool
10/07/1987EP0240234A2 Improved seal and bearing apparatus for bits
10/07/1987CN87102255A Pocketed stud for polycrystalline diamond cutting blanks
10/06/1987US4697654 Rotary drill bits
10/06/1987US4697653 Diamond setting in a cutting tooth in a drill bit with an increased effective diamond width
10/06/1987US4697652 Reversible roller stabilizer extensions for earth boring head
10/06/1987CA1227789A1 Roller cutter drill bit having a texturized seal member
10/06/1987CA1227788A1 Drill bit having angled nozzles for improved bit and well bore cleaning
10/01/1987DE3610015A1 Boring device for making boreholes
09/1987
09/30/1987EP0239328A2 Drill bits
09/30/1987EP0239295A2 Process for forming hard cutter insert bearing cones for rock bits
09/30/1987EP0239178A2 Rotary drill bit
09/30/1987EP0238938A1 Pocketed stud for polycrystalline diamond cutting blanks
09/29/1987US4696355 Drilling tools
09/29/1987US4696354 Drilling bit with full release void areas
09/29/1987US4696352 Metal carbides, nitrides, oxides; coal, concrete, masonry, rocks;
09/23/1987EP0237867A2 Changeover bit for extended life, varied formations and steady wear
09/22/1987US4694919 Rotary drill bits with nozzle former and method of manufacturing
09/22/1987US4694918 Rock bit with diamond tip inserts
09/22/1987US4694916 Continuous coring drill bit
09/22/1987US4694551 Method of remanufacturing a rock drill bit
09/17/1987DE3607387A1 Extremely hard cutting bits for drilling tools
09/16/1987EP0237359A2 Rotary drag bits
09/16/1987EP0236924A2 Diamond setting in a cutting tooth in a drill bit with an increased effective diamond width
09/15/1987US4693328 Expandable well drilling tool
09/15/1987US4693325 Sonic drill employing orbiting crank mechanism
09/09/1987EP0236086A1 An insert for a tool
09/09/1987EP0235455A2 Percussion rock bit
09/08/1987USRE32495 Chip relief for rock bits
09/08/1987US4691790 Method and apparatus for removing the inner conduit from a dual passage drill string
09/08/1987US4691787 Earth auger
09/08/1987CA1226572A1 Rock bit cone
09/02/1987EP0235105A2 Drill tool
09/01/1987US4690691 C,p partitioned; multzonal; cubic boron nitride;
09/01/1987US4690229 Radially stabilized drill bit
09/01/1987US4690228 Changeover bit for extended life, varied formations and steady wear
08/1987
08/26/1987EP0233851A1 Cutting element comprising a composite brazed to a stud
08/26/1987EP0233737A2 Mounting means for cutting elements in drag type rotary drill bit
08/25/1987US4688651 Cone mouth debris exclusion shield
08/25/1987US4688647 Drill bit having a failure indicator
08/25/1987CA1225986A1 Rock drill bit
08/25/1987CA1225985A1 Soil-displacement drill and method for manufacturing pile
08/19/1987EP0233037A2 Drill bit with removable inserts
08/18/1987US4687067 Crossflow rotary cone rock bit with extended nozzles
08/18/1987US4687066 Rock bit circulation nozzle
08/12/1987EP0231414A1 Earth auger
08/11/1987US4686080 Diamond, boron nitride bonded to hard-sintered alloy; drill bit
08/11/1987US4685359 Method of hardfacing steel bodied bits
08/11/1987US4685339 Soil sample taker and vehicle mounting arrangement
08/05/1987CN86107719A Method of large diameter boring and drill head for directional enlarging
08/04/1987US4683965 Triangular oil well drill bit for use in unconsolidated formations
08/04/1987US4683781 Cast steel rock bit cutter cones having metallurgically bonded cutter inserts, and process for making the same
08/04/1987CA1224949A1 Method of and means for reconditioning percussion drills
07/1987
07/29/1987EP0230129A1 Drill bit lubrication system
07/28/1987US4682663 Mounting means for cutting elements in drag type rotary drill bit
07/28/1987US4682662 Drill adapter
07/28/1987US4682661 Drilling apparatus
07/28/1987US4682660 Hydro-drill with circular impression
07/21/1987US4681174 Diamond crown bit
07/14/1987US4679858 Mining machine cutter pick insert
07/14/1987US4679640 Method for case hardening rock bits and rock bits formed thereby
07/14/1987US4679639 Rotary drill bits and cutting elements for such bits
07/14/1987US4679637 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein
07/14/1987US4679636 Method and apparatus for coring rock
07/08/1987EP0228289A2 Method of remanufacturing a rock drill bit
07/08/1987EP0228138A2 Process for placing a concrete pile in the ground and a screw drill and casing to be used in the process
07/07/1987US4678237 Cutter inserts for picks
07/07/1987CA1223864A1 Rotary drill bit seal
06/1987
06/30/1987US4676324 Drill bit and cutter therefor
06/30/1987US4676124 Drag bit with improved cutter mount
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